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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) - USD ($) $ in Thousands | Nov. 30, 2017 | Nov. 30, 2016
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 183,902 | $ 249,894
Unrealized Gains | 0 | 0
Unrealized Losses | (293) | (140)
Fair Value | 183,609 | 249,754
State and Municipal Bond Obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 40,458 | 32,831
Unrealized Gains | 0 | 0
Unrealized Losses | (231) | (107)
Fair Value | 40,227 | 32,724
US Treasury Bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,517 | 6,542
Unrealized Gains | 0 | 0
Unrealized Losses | (26) | (29)
Fair Value | 3,491 | 6,513
Corporate Bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 6,463 | 3,485
Unrealized Gains | 0 | 0
Unrealized Losses | (36) | (4)
Fair Value | 6,427 | 3,481
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 130,547 | 196,863
Fair Value | 130,547 | 196,863
Money Market Funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 2,917 | 10,173
Fair Value | $ 2,917 | $ 10,173

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